\chapter{有理数}

\section{有理数的意义}\label{sec:1-1}

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\section{有理数的加法和减法}\label{sec:1-2}

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\section{有理数的乘法和除法}\label{sec:1-3}
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\section{有理数的乘方}\label{sec:1-4}
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\input{units/czds1-ch1-fuxi}

